Update lexxy to fix # prompt editor freeze

[jorgemanrubia]

Summary

• Updates lexxy from version pin to github main (4b718b0) which includes the fix for the editor freeze when typing # followed by space
• The race condition caused selectionTransform crashes when the markdown heading shortcut consumed the # trigger during async prompt loading (RemoteFilterSource debounce)
• Three race paths fixed: during first popover load, after visible popover, and during cached popover reload

Fixes https://app.fizzy.do/5986089/cards/3454
Lexxy PR: basecamp/lexxy#881

[Copilot]

Pull request overview

This PR updates the app’s Lexxy dependency to pull from the basecamp/lexxy GitHub main branch (locked to commit 4b718b0…) to address the prompt editor freeze when typing # + space.

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Changes:

• Switch Lexxy from a Rubygems version pin to the GitHub main branch in Gemfile.
• Update Gemfile.lock to lock Lexxy to the specified Git revision and reflect dependency resolution updates.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
Gemfile	Moves Lexxy to a GitHub-sourced dependency on main.
Gemfile.lock	Locks Lexxy to the target commit and updates resolved dependency versions.

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[Copilot]

Pull request overview

Updates the lexxy dependency to a specific GitHub main revision that includes the upstream fix for the prompt editor freezing when typing # followed by a space (selection transform race during async prompt loading).

Changes:

• Switch lexxy in Gemfile from a version pin to the Basecamp GitHub repo main branch.
• Update both Gemfile.lock and Gemfile.saas.lock to lock lexxy to revision 4b718b0….
• Convert dependency entries to Bundler’s git-source form (lexxy!) in lockfiles.

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Click "Convert to draft" or run gh pr ready --undo.
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Reviewed changes

Copilot reviewed 1 out of 3 changed files in this pull request and generated 1 comment.

File	Description
Gemfile	Sources lexxy from the Basecamp GitHub repo main branch.
Gemfile.lock	Locks lexxy to the specified git revision for the default bundle.
Gemfile.saas.lock	Locks lexxy to the specified git revision for the SaaS bundle.

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[Copilot]

Pull request overview

This PR updates the app’s Lexxy dependency from a RubyGems version pin to the Basecamp GitHub main branch (locked to revision 4b718b0…) to pick up upstream fixes for the # + space prompt/editor freeze in Lexxy.

Changes:

• Switch lexxy in Gemfile from 0.8.5.beta to the Basecamp GitHub repo on main.
• Update both lockfiles to reflect Lexxy being sourced from Git (and record the exact revision).

Reviewed changes

Copilot reviewed 1 out of 3 changed files in this pull request and generated no comments.

File	Description
Gemfile	Moves lexxy from a version pin to bc: "lexxy", branch: "main".
Gemfile.lock	Records Lexxy as a Git dependency at revision 4b718b0… and updates dependency metadata.
Gemfile.saas.lock	Mirrors the Lexxy Git dependency change for the SaaS bundle lockfile.

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Click "Convert to draft" or run gh pr ready --undo.
Click "Ready for review" or run gh pr ready to reengage.

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